Automatic stop for automatic-controlled motors



Nov. 30 1926. 1,609,182

0. C. NELSON ET AL AUTOMATIC STOP FOR AUTOMATIC CONTROLLED MOTORS Filed August IL. 1923 N VEN TORS 0770 C. Ne/son Nor/1L5 E. Ne/aon a W ATTORNEY Patented Nov. 30, 1926.

UNETED STATES-PATENT OFFICE.

OTTO C. NELSON AND NORRIS E. NELSON, F SEATTLE, WASHINGTON.

AUTOMATIC STOP FOR AUTOMATIC-CONTROLLED MOTORS.

App1ication filed August 4, 1923.

The invention is a simple and eiiicient means for automatically or manually stopping an automatic or button controlled motor by using a low voltage or auxiliary current which will instantly return all of the switches to the position ready for starting.

An object of this invention is to provide a means for making or breaking a circuit, operated by a battery or other low voltage current, for use with automatically controlled motors in shops and on machines and in such places as where a current of high voltage is used and it is desired to break, or make, as the case may require, the circuit which causes the motor to stop, from a re mote point or any position. or any number of points, where it is not desirable or possible to carry a high voltage current.

A further object in this invention is to provide a simplified and more sensitive means to stop an automatically controlled motor from a remote point or any position or any number of points.

Another object of this invention is to utilize standard stock and easily purchasable elements in the construction of a device of this character.

Another object of. this invention is to provide a device of this character which automatically breaks the local magnetic circuit vhen the motor is stopped.

Another object of this invention is to provide a simple and efficient method for automaticallystopping an automatic or button controlled motor as trouble develops in the machine or shop.

And a further object of the invention is to provide an auxiliary or low voltage circuit For making or breaking a secondary circuit and a means tor breaking the controlling circuit or the motor as the secondary circuit is made or broken.

And a still further object of this invention is to provide a simple and efiicient method for breaking the main circuit of an automatic or button controlled motor by a mag not or solenoid operated by a low Voltage current which will instantly return all of the switches to the starting position.

IVith theseends in view the invention embodies a magneticallycontrolled switch or relay for breakingthe circuit of a motor, a low voltage circuit provided with suitable switches for energizing the magnet or relay as trouble develops in the line, an automatic means for breaking this'circuit as the motor Serial No. 655,765.

is stopped, a bank of switches for determining wherein the trouble lies, a timer for causing the device to operate at the proper time, and a secondary circuit that may be installed between the low voltage circuit and the motor controlling circuit which may be used with very large motors.

Other features and advantages of the in vention will appear from the following description taken in connection with the drawings, wherein Figure 1 is a diagrammatic view showing the circuits as they may be connected to the controller box.

Figure '2 is another diagrammatic View showing an alternate arrangement where a secondary circuit may be used between the low voltage or battery circuit and the motor controlling circuit for large motors.

In the drawings we have shown our device as it would appear wherein numeral 1 indicates the controller box of an automatic or button controlled motor, numeral 2 a magnet or relay that may be installed in the stop circuit to operate it in a manner similar to that in which. it is operated when the stop button is pushed, numeral 3 a bank of switches to determine which of the auxiliary circuits has been completed, and numeral 4 a timer for closing the auxiliary circuits at predeterntiined intervals.

The controller box 1 may be constructed as shown with a solenoid 5 for raising the rheostat arm 6 and a magnet or relay 7 for breaking the main circuit through the points 8 and 9 as the stop circuit is broken.

An arm 10 may beattached to the rheostat arm 6 through a bar of insulation 11 and a pivot pin 12, and the upper end of this arm has an extension 13 on it which projects through an opening 14 in a plate 15. The plate 15 is attached to a bar of insulation 16 which is held to the controller box by screws 17 and on the upper side of the plate 15 is a spring plate 18 and a contact point 19 with insulation 20 between them. A post 21 is placed on contact point 19 to which one 01: the wires of the auxiliary circuit may be connected, and the contact point 18 may be grounded or connected into the auxiliary circuit as shown. It will be seen that when the rheostat is off, the upper end of the arm 10 will hold the spring plate down as shown, and when the rheostat and motor are on, the

arm 6 will move upward and the upper end or. the arm 10 will move to the position shown in dotted lines so that the spring plate 18 may move upward to the position shown in dotted lines and form a contact with the outer end of the contact point 19. This will form a contact between the wires 22 and 23 which are in an auxiliary circuit that operates the magnet 2. The wire 22 may have a battery 24 in it ormay be connected in any low voltage circuit as may be desired.

The wire 23 will extend to any number of contact points which may be placed on a machine or in a shop in any desired manner. Should it be desired to use the machine as a ground for a'low voltage circuit the insulation 16 may be replaced by metal so that a ground-connection would be made directly to the machine and in this case the points 25 may be connected to thernachine or may be parts of the machine. Levers26 may also be placed ,uponthe machine-or in any vdesirec location and will be arranged so that as trouble develops they will be moved until they engage the points 25, or when the machine .is used as a ground these levers 26 may be set so that they will be forced against a part of the machine when-trouble of any nature occurs. Wires 27 extend from the levers 26 to terminals 28 in the bank of switches 3 and other wires 29 may extend from the opposite terminals 30 of the switches to a common wire 31 which connects. them with a main switch 32. The main swit h 32 is connected to the magnet or relay 2 by awire and the opposite terminal of the magnet or relay'is connected to the wire 22 It will be seen that as the switches 3 are set so that they will engage both of the terminals 2S and 30 and-as the plate 18 is in contact with the plate 19this auxiliary circuit will be complete with the exception of the points25 and 26; and then as these points are brought into engagement by trouble in the line or in the case of the machine being used as aground by one of the points 26 being forced against a part of the machine, while the controller arm 6 is up in the operating position the low voltage circuit will be completed and the magnet .or relays 2 energized.

As the magnet or relay 2 isenergizedit will draw the contact point id-away from the point 35 .and break a circuit which may be the ordinary stop circuit of the motor. lVe have outlined this circuit by showing a stopbutton 36 connecting terminals 37 and 38 and havinga wire .39fextendillg from the terminal. 37.to the .point'35, a wire 10 extendingftrom the contact point to a power line A1 anda wire 452 extending from the terminal38to themagnetig Theo posite terminaloithe magnet *7 .is connecte d' byfla wire vi to the solenoid, 5 and the opposite terminal or thesolenoidi's lconnected by a Wire Atto.;tl1eLpowerIline Alf The: 1&3

is also connected by a wire to the contact point 8 of the relay 7 and also by a wire so to a terminal 4-7 of the starting button as, the opposite terminal 49 of which is connectedby a. wire 50 to a power line 51 and also by a wire 52 to the contact point 9 or the relay 7.

It will be seen that as the starting button 18 is pushed downward it will complete a circuit from the power line 51 through the wires 50, 16, and 4.3 to the solenoid 5 and through the wire 1 1 from the solenoid to the opposite powerline 11. Another circuit will also passfrom the power line 51 through the wires 50, ll), and -13, the magnet 7, the wires 12, 39, and 20 to the opposite power line 41, which circuit will pass through ,the stop circuit-and energize the magnet 7 which will hold the contact points Sand 9 into engagement and permit the motor controlling circuit to pass from the power line 51 through the wires 50 and 52, the points 8 and 9 and the wire 15 to the solenoid and from the solenoid through the wire 1 1 to the opposite power line 4L1. This will constitute the running circuit as the starting button l-S is instantly released as soon as themagnet T energized. and contact points 8 and 9 brou t into engagement; and it will be seen that as soon as the auxiliary circuit is completed andthe magnet 2 energized the point 3 1 will be drawn away from the point and the stop'circuit which passes through the magnet T will be broken 50 that the contact point 8 will drop away from the point 9 and the machine will then remain idle until the start ing button 48 is again pushed downward.

A timer 1 may be placed in any of the auxiliary circuits and may be set so that it will only be possible to complete the circuit at predetermined intervals, as-in the case of: objects moving through a passage there may be regular spaces between the objects and the timer may be set so that the circuit may only be completed when it is time for the objects to pass between or engage the points.

1n the design shown in Figure 53 we have shown a secondary circuit that may be installe'dbetween the low voltage or battery It and the motor controlling circuit, or between the magnet 2 and the contact poinis 34 and 35, as when a very large motor is usedthe low voltages or battery circuit may not be strong enough to break the contact points and therefore it may be found neces sary to operate a secondary circuit by the low-voltage or battery circuit and have the secondary circuit operate the controlling cir' cuit. The magnet-J2 may be connected to the wires'22 and 133 of the auxiliary circuit-in the same manner and as the magnet is 'energize'd itwill draw a contact point 53 intoengagement with the point which will complete circuit from the power'line e1 tinfoilt thefWire -M, the points 53:a 1d 52, a

wire 55, a solenoid 56 and a wire 57 to the opposite power line 51. As this circuit is completed the magnet 56 will draw the contact point 34: away from the point 35 and break the stop circuit as hereinbefore described.

It will be understood that changes may be made in the construction without departing from the spirit of the invention. One of which changes may be in the design of the switch formed by the contact points 18 and 19, or in its location, or in the means for operating it; another may be in the use of a different means for operating the arm 6; and still another change may be in the design or location of the switches formed by the contact points 25 and 26, a it is understood that these may be of any suitable design and may be located at any suitable points.

The construction will be readily understood i'rom the foregoing description. To use the device it may be arranged and installed in a machine, shop, building or any suitable location and the contact points 25 and 26 set so that they will either make or break the circuit as trouble or anything unusual occurs. The device may also be set to stop a machine at the end of a predetermined time or after a predetermined niunber of objects or amount of material has passed through as the last object passes through the contact points 25 and 26 may engage or disengage and stop the motor. lit will be seen that with a device of this type is will be possible to stop a machine instantly on very delicate work as by hav-' ing a low voltage circuit passing through the points 25 and 26 it will be possible to set them very accurately without danger of them fouling, and therefore, it will be par ticularly adaptable to machines similar to newspaper assembling machines as it will be possible to set any number of pairs of the points 25 and 26 all over the machine and as sections of paper of the wrong thickness pass through the different stages the points will engage or disengage. as the case may be, and instantly stop the machine. The timer 1 may be set so that at predetermined intervals certainsections of the paper may or may not pass through a certain stage without stopping the machine. This flexibility of the device will make it possible to positively and automatically govern the most minute movement of the machine. W'heu trouble has developed the switches 3 may be set so that they may be engaged or disengaged individually which will make it possible to quickly determine which circuit the trouble is in. Furthermore, it will be seen that as soon as the device stops the motor the auxiliary circuit will instantly be broken by the separation of the points 18 and 19 so that the entire system may in stantly return to the position ready for starting.

Having thus fully described the invention what we claim as new and desire to secure by Letters Patent, is

1. A magnet means for making or breaking the controlling or stop circuit of an automatically controlled motor, a circuit controlling said magnetic means and a means for making or breaking said controlling circuit, said means being operative by the operation of the motor controller.

2. A means for automatically breaking the controlling circuit of an automatically controlled motor comprising a magnet; contact points adjacent the magnet which will open as the magnet is energized and close as the circuit is released; automatic switches in the said magnetic circuit which will operate when trouble develops and energize the magnet and a means for automatically releasing said auxiliary circuit as the control ling circuit is broken.

In a motor controller, an auxiliary circuit connected in the stop circuit of the controller, a magnetic means in the auxiliary circuit to operate the stop circuit to stop the motor as the magnetic means is energized, and a means in the said auxiliary circuit for de-energizing the said magnet, and thereb} placing the motor in the position ready for starting as soon as the motor is stopped.

4. In a means for automatically stopping the motor, a stop circuit, a switch in the said stop circuit, a means for operating the said switch, an auxiliary circuit connected to the said switch operating means, a switch in the auxiliary circuit, means for closing the said switch as the motor is started, and for opening the said switch as the motor stops and means in the said auxiliary circuit for completing a circuit therethrough, and thereby operating the said switch operating means as an unusual condition develops.

5. In a means for automatically stopping a motor, a stop circuit, an auxiliary circuit, a means in said auxiliary circuit for causing the circuit to be closed as the motor is running and opened when the motor is stopped, a means for closing said auxiliary circuit as an unusual condition develops and a means for operating said step circuit of the motor by the said auxiliary circuit.

OTTO QNELSON. NORRIS E. NELSON. 

